Construcciones y Auxiliar de Ferrocarriles, S.A. designs, manufactures, and sells rolling stock and rail components in Spain, France, the United Kingdom, Poland, and internationally. The company operates through two segments, Rolling Stock and Buses. It offers high speed trains, regional trains, commuter trains, metros, LRV's and tram-trains, trams and light metros, locomotives, and buses. The company also provides equipment and components, including wheel sets, wheels, axles, and gear units, as well as after-sales services comprising technological advice and inspection guidelines; and traction systems and converters, energy storage systems, and control and communication systems, as well as financing solutions. In addition, it designs, manufactures, supplies, and maintains railway signaling systems. Further, the company is involved in the provision of maintenance, and refurbishment and upgrading services; data collection, storage, and processing and analysis services; management of spare parts and workshop equipment; and technical support and consultancy services. Additionally, it develops turnkey solutions that cover a range of activities, such as viability analysis and studies; system design and engineering; construction and manufacture of the system, including civil works, electrification, signaling, and other electrochemical systems; installation and commissioning; and operation and maintenance services. The company was formerly known as Compañía Auxiliar de Ferrocarriles S.A. and changed its name to Construcciones y Auxiliar de Ferrocarriles, S.A. in 1971. Construcciones y Auxiliar de Ferrocarriles, S.A. was founded in 1892 and is headquartered in Beasain, Spain.